Back-geared motor.



A. M. GRAY. BACK GEARED MOTOR. APPLICATION FILED FEB. 28, 1910 983,361 Patented Feb. '7, 2911.

UNITED STATES PATENT OFFICE.

ALEXAIIDER M. GRAY, OF MILWAUKEE, WISCONSIN, ASSIGNOR T0 ALLIS-CHALMERS I COMPANY, A CORPORATION OF NEW JERSEY.

BAGK-GEARED MOTOR.-

Specification of Letters Patent.

Patented Feb. '7, 1911.

Application'filed February 28, 1910. Serial No. 546,542.

To all whom it may concern:

Be it known that I, ALEXANDER M. GRAY, a subject of the King of England, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Back- Geared Motors, ofwhich the following is a full, c ear, and exact specification,

This invention relates to dynamo-electric machines, and particularly to back-geared electric motors.

In driving machinery or apparatus at low speed by electric motors, it is sometimes necessary to employ a back-geared shaft or counter shaft with speed-reducing gearing between the counter shaft and main shaft of the motor, in order to obtain sufiiciently low speed for the apparatus driven byvthe motor. It is generally desirable that the motor and back-geared shaft be in the form of a unit and that the back-geared shaft be so supported on the motor frame that it may be adjusted circumferentially relatively to the main motor shaft, so that the motor may be placed in various positions relative to the driven machinery or apparatus. It is also desirable that as many parts or as much as possible of a standard motor be employed in the construction of a back-geared motor in order that the cost of the latter will not be excessive' v The object of the present invention is to provide a back-geared motor, which contains very few special parts not employed in a standard motor and is thus inexpensive and simple in'construction, and which is provided with a back-geared shaft so supported on the motor frame that it is capable of adjustment circumfercntially about the main motor shaft.

In curryingout my invention I provide a back-geared motor having a counter or baelegearcd shaft whichis supported on the field yoke of standard construction and prefgrably upon the base of the yoke which in 'a. standard motor is utilized for supporting the 'motor. Instead of supporting the motor by the field yoke as in the usual motor construction, I employ special end heads or housings to which the yoke is bolted and support the motor by suitable feet or bases provided on the oud'lu-uds. 'lhe yoke and end heads a re secured together by equally spaced bolls so that the yoke and back-gearml shaft i may be secured in various positions relative to the main shaft by removing the bolts, turning the yoke through an are equal to one or more times the spacing of the bolts and by again tightening the bolts.

For a better understanding of my inven tion, reference is had to the accompanying sheet of drawings in which Figure 1 iso. side elevation of a backgeared motor constructed in accordance with my invention, the back-geared shaft or counter shaft being arranged at one side of the motor frame; and Fig. 2 is an end yiew of the same.

Referring now to the figures of the draw- 111g, 10 represents the main shaft of themO- tor, and 11 the armature which may be of the usual or standard construction, and 12 represents as a whole the field frame. As is well known, the frame of a direct current. motor usually consists of a field yoke having a base by means of which the motor is supported and is bolted to any suitable support mg member, and end heads or housings which are bolted to the yoke and carry bearings and bearing housings for the motor shaft. In this case I employ in the frame a yoke 13 which is of standard construction and has projecting portions comprislng an integrally formed base 14 and feet 15 on which the motor is ordinarily supported, and I employ in the frame end heads or housings 16 and=17 which are secured by equally spaced bolts 18 to the yoke and are provided with bearing housings 19 containing the usual hearings in which the main motorshaft 10 is ournaled. Each of the end heads is provided withbearing or supporting feet 20 for supporting the motor, the feet 20 being adapted to be bolted to a support in the same manner that the feet on the base of a standard motor yoke are bolted.

Thcfeet 15 of the yoke are utilized for supporting the back-geared shaft or counter shaft which is designated by the reference character 21 and is connected to the main shaft 10 'of the motor by speed-reducing gearing, the back-geared shaft having a large gear wheel 22 which meshes with a comparalivoly small gear wheel 23 shown by dotted lllKS in Fig. 2. The back-geared shai't Q! is iournaled in bearings 24 carried by hearing housings which are'preferal'ily formed integral with a bracket 26 which is secured by bolls 27 to the feet 15 of the yoke.

It will be seenthat as far as the motor armature and frame are concerned, only two special parts need be employed, namely,

the end heads or housings 16 and 17. It

will be seen also that the motor will be as firmly supported, and probably more firmly,

- than if it were supported on the feetof the yoke: The back-geared shaft, which, vas

"10. a -'and-number of bolts, which are employed hereshown, isarra'nged at the side of the motor frame, may, with the arrangement I for securing the end heads to the yoke, be

= arran ed in four different ositions, namely,

on eit er side of the framat the top of the frame or. at thei'b'ottoin of the frame, the

field yoke i 13 being ..capable- -of adj ustment through arcs'equ'a'l to one or more times the spacing of the bolts 18; It will be understood, of cou-Isefthat if more than four boltsl'8iare employed for securing-each end.

headto the yoke,the back-geared shaft may bearranged-in more positions relative to, the

main motor shaft 10. The backgeared motor, which I have provided, is, therefore,

inexpensive. 'to manufacture, is rigidand quite free fi'o'm vibration, and -in fact is satisfactory in all respects' I,

I do not desire to. be confined to the exact details shown but aim in myclaims to cover all modifications which do not involve a departure fromthe spirit and scope of my in-' vention.

What I claim as new and desire to secure by Letters Patent is: I 1

'1. In a dynamo-electric machine, a main. shaft, 8. frame comprising afield 'yoke'and end heads which have supporting portions and which are secured to the yoke and sup- "port the main shaft, and .a countenshaft .40ksupportedon the yoke, said end heads being stationary'and' said yoke being adjustable relatively-thereto.

2. Infcombination, in a motor, ma in I shaft, a frame comprising a yoke and end the yoke.

, :4. An electric motor having an'armature and armature shaft, a field frame comprisg 4 y fi and end heads secured to-the yoke, the end heads having bearings for the armature shaft and having feet for supporting the motor, and a backgeared shaft mounted upon the yoke.

5. electric motor having a main shaft, afield frame'comprisin'g end heads and a yoke which is adjustable relative to the end heads,the end heads having supporting feet main shaft, and a back-geared shaftsupported by. said yoke.

6, A back-geared motor having a main shaft, a field frame coinprising end heads having projecting portions and. which sup port the main shaft, and a, oke which is adjustably secured to the en heads and is for the motor and having bearings for the provided with-projecting portions, and a counter shaft geared to the main shaft and yoke, the. supportingfporti heads and yoke beingcapable-of'being disposed at' an anglev with each other.-

.7. An electric motor having a main shaft,

aframe comprising end heads which sup port the "main shaft and are provided with feet for supporting the motor and a yoke which is bolted-to the end heads and is,ad-' 'justable oircumferentially relatively thereto,

.xpported on saidprojecting portions of the v ons of the end said yoke having a supporting portion, a

counter-shaft geared to the main shaft, andasu'pporting bracket for the counter shaft bolted to the'fsupporting portion of said yoke. I I 8.. In combination, in a motor, amain shaf t ,-a frame comprising a movable yoke having standard'feet and end heads which are secured to the yoke, said end heads also having standard feet, and a counter shaft supported on the feet of said yoke, the feet of said end heads and yoke being capable of beingdisposed at an angle with each other. 1 9. In "a dynamo-electric machine, stationary end heads havin supporting feet, a

yoke relatively rotatab e with respect to said end' heads, equally circumferentially spacedmembers for securing said end heads to said yollie, and a countershaft carried by said 0 e. f i -10. In adynamo-electric machine, stationary end heads having supporting menu bers, a yoke relatively rotatable with respect to. said end heads, equally circumfereutially 'spaced bolts for securing said end heads to said yoke, and a counter shaft carried by said yoke. 4

: Mil \vaukee,-Wis.,Feb.'23, 1910.

In testimony whereof I afiix my signature,

in the presence oftwo witnesses.

ALEXANDER. GRAY.

. Witnesses s CHAS. L. Briton, Rom 'ziS'rArm. 

